Table 4-52. Highway Noise Barrier Construction (Miles)

Table 4-52. Highway Noise Barrier Construction (Miles)

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  Unknown R1970-79 R1980-89 R1990 R1995 1996 1997 1998 Total 1970-98
Type I barriersa 6d 102 419 44 87 34 47 114 1,146
Type II barriersb 0 70 128 19 32 15 31 22 391
All other typesc N 2 28 0 6 0 1 1 79
Total length 6 175 575 63 125 49 78 137 1,623
Cost (1998 $ millions) N 134 656 89 152 60 111 169 1,931

a A Type I barrier is built on a highway project to construct a new highway or to physically alter an existing highway.
b A Type II barrier is built to abate noise along an existing highway (often referred to as retrofit abatement) and is not mandatory.
c All other types of barriers are nonfederally funded.
d Have not been assigned a year of construction or a cost.

KEY: N = data do not exist; R = revised.

NOTES: Miles have been converted from kilometers. Totals may not match the sum of yearly estimates due to rounding and converting from metric. 24 miles of barriers, while assigned a year of construction, cannot be assigned a cost. Data are produced on a 3-year cycle.

SOURCE: U.S. Department of Transportation, Federal Highway Administration, Office of Environment and Planning, HighwayTraffic Noise Barrier Construction Trends (Washington, DC: 2000), tables 1 and 3.